You're probably going to laugh but give it a try anyway, what have you got to lose?
Close the blinds and lock the door. (you don't want spectators)
While holding a glass of water, bend over until your head is about the level of your knees.
Slowly drink as much of the glass of water as you can in one breath.
Don't straighten up until you're sure it worked
I know it sounds wacky but it has never failed me
